Reproduction in animals

In biology, what other name do we give to sex cells? Gametes How many sets of chromosomes do sex cells carry? Only one. Cells which carry only one set of chromosomes are called… Haploid cells What are diploid cells? Cells which carry 2 sets of chromosomes Where do these 2 sets of chromosomes come from? One from mum and one from dad

What is fertilisation? Fusion of the nuclei of the two gametes. What is the name given to the first cell formed? Zygote After the first division, the zygote becomes… An embryo Where does fertilisation take place? What is the difference between fertilisation in land animals and in fish? Fish deposit their sperm on the eggs outside of the female body.

1/ Reproduction in animals In biology, sex cells are called g_________________. _______________ contain and carry only ________ set of the parental chromosomes (half of the genetic material), they are said to be ___________. ________________ is the fusion of the nuclei of the two haploid gametes to produce a z_________ (i.e. the first cell obtained from fertilization). The _____________ will then divide to form the _______________. In land mammals, fertilization takes place ___________________, i.e. the sperm is deposited ____________ the female body. In fish, fertilization takes place ___________________, i.e. the sperm is deposited ______ the eggs, _____________ the female body.. ametes Gametes one haploid Fertilisation ygote zygote embryo internally inside externally over outside

Male Reproductive System Name and function Name Features Site of production

In males, the __________ is the male gamete. It is produced in the ______________. It travels in the ___________ __________ before it reaches the _____________ which allows it to be released inside the _____________ of the female. sperm testes sperm duct penis vagina

Female Reproductive System Name and function Name Features Site of production

In females, the _______ is produced in the ______________. Once a month, an egg is released in the _________. It is in the _____________that the ovum meets the sperm and that _____________________ can take place to form the z__________. After the first division, the embryo travels down the oviduct until it reaches the ____________ where implantation (i.e. its burying into tissue) can take place. egg ovary oviduct fertilisation ygote uterus

Lets think a bit more deeply! Internal/external fertilisation, why the need for two systems? The stickle back as an example of external fertilisation And after, what are the different strategies adopted in terms of location/nourishment of the developing embryo. – Oviviparous – Viviparous: us – Oviparous:

Reproduction in plants

Stamen Stigma Ovary Nectary Petal

Attract pollinators Where pollen lands Contains the egg cell (Female gamete) Produce a sugary liquid to attract pollinators Produces pollen grains, the male gametes

P___________ is when ­­­­­­a pollen grain is transferred from an ___________to a _________. After landing on the stigma, the pollen grain germinates, i.e. it grows a pollen tube which eventually reaches the__________. The male gamete travels down the pollen tube to fuse with the female gamete to form the ________ (Fertilisation) ollination antherstigma egg zygote